Al-Kāfi - Volume 5 > The Slogan
Hadith #2

2- عَلِيٌّ عَنْ أَبِيهِ عَنْ بَعْضِ أَصْحَابِهِ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ قَدِمَ أُنَاسٌ مِنْ مُزَيْنَةَ عَلَى النَّبِيِّ (صَلَّى اللهُ عَلَيْهِ وَآلِه) فَقَالَ مَا شِعَارُكُمْ قَالُوا حَرَامٌ قَالَ بَلْ شِعَارُكُمْ حَلالٌ. وَرُوِيَ أَيْضاً أَنَّ شِعَارَ الْمُسْلِمِينَ يَوْمَ بَدْرٍ يَا مَنْصُورُ أَمِتْ وَشِعَارَ يَوْمِ أُحُدٍ لِلْمُهَاجِرِينَ يَا بَنِي عَبْدِ اللهِ يَا بَنِي عَبْدِ الرَّحْمَنِ وَلِلأوْسِ يَا بَنِي عَبْدِ اللهِ.

2. Ali ibn Ibrahim has narrated from his father from certain persons of his people from al-Sakuniy who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said that certain people from Muzaynah came to the Holy Prophet. He asked, ‘What is your slogan?’ They replied it is ‘unlawful’. He said, ‘No, it is ‘lawful’.”